Altimeter



Jan. 23, 1923.

E. CHAUSSARD.

ALTIMETER.

FILED SEPT. 5, I922.

Patented Jan, 23, l d.

ERNEST CHAUSSAJRJD; OFPillllhtllil," FRANCE, ASSIGNOB TO SOCIETE D$TIQUE ET DE Mill'fiilllqlQUlE DE HAU'IEIPRILGISION; OF PARIS; FRANCE; ALIMITED JOINT STOCK COMPANY ALTIMETER.

Application filed scptember 5, 1922. Serial No. 586.350.

./o a whom it may concern.-

Be it 'known that ll Ennns'r (hunssinnn a citizen oil thecRepublio of-France, resident of Paris,France, have invented new and use- 5 ful Improvements in and relatingto AltlI11'8tG1?S,' for whichl have made application in France on August i 11 a 1921, and which is fullyset forth in the following specifica tion,

This invention has for its objectian altimeter, i. .e. an instrument which has for its object to determinethe height of a visible object abovethe horizontal plane sight ed by an observer.

15 The objects of this invention will best beunderstood by reference to the following description and accompanying drawings, in which Fig. 1 a diagram illustrating the principle onwhi chuthe invention based;

l igf2is a diagraininatic side elevation of a known apparatus otthe type herein reterred to; i i

Fig. Eris sectional elevation onthe line ott-Fig. at; illustratingone embodiment otthe present invention.

Fig. a top plan view of the parts shown :in 3, portions. oil the teleineter being broken away i l a i 3 Referring'to the diagram shown in Fig.- 1'0 is an observation station,-l3 a Visible object San angle ofelevation of the sighted object,. (Z the distance, 0-13 and h the 3 solves this: proble1nis;-1-

ib fd S l r There a e apparatuses solv problem which are used 11 wlth a telelneter, the latter apparatus-b u the derived formula 3. d sinS by means of an arrangement of sliding rules and linked bars height to be determined, the formula which Fig. 2 shows diagrannnatically in eleven tion a known apparatus of this type. In this figure T shows a inonostatic teleineter oi any known type integralwith the support T of a rule Di the Whole being capable of pivoting around a horizontal axis 0 upon a vertical support F acting); as a graduated. scale; The ruleor bar D is in athorizontal position whenthe horizon is sighted with the telemeter'.

'livo blocks A and U can slide in a guide D provided along" the HXiSOlI the rule D. The sliding); block A .is mechanically con I'lQt'lGfd to'the inner mechanism of the telemeter in such a manner, which is old and well known in the art, as to be displaced n'oportionallv to that is to tho reciprocal of the distance cl of the object, measured by the said teleineter.

The slit blocl; l is loosely guided in a guide D which is linked to a rod G, linked in. its turn at its other end to a block B which is capable ot sliding in a guide F provided in the rule" F.

A rod M A is linked to the middle point M of the rod G, which rod MT fl has a length equal to hit-(.1 ainlitl-Bfimd is linked at its otl'ier end to the sliding block A.

' It follows from the above arrangernei'it that the line joining: B to A is constantly at a right angle withthe rule D.

It follows that" the angle 0 B A is, at any moment equal to the angle of elevation S of the sighted object and that the dist'ncc O 15 measured on the vertical rule lh at any moment proportional to since in the triangle (ll- 1kt 1|. M (Z r 72, sin S 9 The above known arrangement has a so rious drawback: the telelneter T rotates around. an axis U which is situated on its outside; therefore, an overhung portion is formed which should be avoided when the size of the telemeter reaches approximately one and a half meters in length, for instance.

plane oi the bars and rules which give instead of being at a right angle with the axis of the telemeter, is arranged parallelly to the latter. 7

Referring to Figs. 3 and t, the latter being a projection upon a plane parallel to the plane 01" sight 0V, the known members referred to in the description of Fig. 2, are designated by the same letters as above.

The angle of rotation S oi the telemeter is reproduced at S in a plane which is parallel to the plane of sight by means of two conical pinions equal in size: E which is kept fixed in space and which may be loosely mounted upon the telemeter T, and E which is loosely mounted about an axis 0 integral with the telemeter.

The pinion E carries the rule F in which is displaced the sliding block B whilst the rule D in which are displaced the sliding blocks A and C, is integral with the telemeter and. is arranged parallel to the axis of the latter. Here also OB is at any moment proportional to Figs. 3 and 4 show that in the triangle OAB of which the angle OAB is at any moment a right angle,

OA sinS Therefore, in order to be able to read the height of the objective at any moment at B on the rule F, OB should he graduated so as to give %and 0A so as to give obtained by connecting the sliding block A with the deviating members K, R, etc. of the telemeter which supplies movements which are Functions of Moreover the altimeter may remain constantly integral with the telemeter, and when taken to pieces it may be folded along the latter.

Having now particularly described and ascertained the nature of my said invention and in what manner the same is to be performed, I declare that what I claim is:-

1. A combined altimeter and telemetcr comprising a bar secured to said telemeler parallel to the longitudinal axis thereof, a graduated rule pivoted to said bar, a link slidably engaging said bar at one end thereof and slidably connected at its opposite end to aid rule, an arm slidably connected at one end thereof to said bar and pivotally connected at the opposite end thereof to said link midway of the length of the latter, said arm having a length equal to half the length of said link, means connecting the firstmentioned end of said arm to said telemeter in such a manner that the distance between said end of said arm and the pivot point of said rule is constantly proportional to the reciprocal of the distance of the objeet sighted. an annular gear member mounted concentric with the longitudinal axis of: said teleineter, and means engaging said member for rotating said rule in proportion to the angular elevation of the si hted object. 7

2. An altimeter comprising in combination with a telemeter, a bar secured to said telemeter parallel to the longitudinal axis thereof, a rule pivoted to said bar at one end thereof, a rod having sliding engagement at its opposite ends with said bar and rule, a linlr slidably connecting said rod to said bar, means connecting the sliding end, of said link to said telemeter in such a manner that the distance between said end of said link and the pivot point of said rule is maintained proportional to the reciprocal of the distance of the object sighted, and means mounted concentric with the longitudinal axis of said telemeter for rotating said rule through an angle proportional to the angular elevation of the object sighted, said rule and rod being disposed in a plane substantially parallel to the longitudinal of said telemeter.

In testimony whereof I have this specification.

Dated this 4th day of August 1999,.

ERNEST AUSS A RT).

Certificate of @oweetieufl It is hereby certified that the name of the assignee. in Letters Patent No. 1,445,005, granted January 23, 1923, upon the application of Ernest Chaussard, of Paris, Franoe, for an improvenmnt in Altimcters, was erroneously written and printed as Sooit dOst-ique et de Mecanique do Haute Precision, Wh6T6LS said name should have been Written and printed as Socit dOptz'g we at de Mecam'que (Ze Haute Prcz'sion, as shown by the records of Jssignmentg in this ofiice; and, that the said Letters Patent should be read. with this correction therein that the same may conform to the vecor'd of the case in the Patent 4 )fiice.

Signed and sealed this 27th day of Februauy A, 1)., 1923.

KARL FENNING,

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lowing Uommzsswner of Patents, 

